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Abstract

In this chapter we investigate two different techniques for transparent/perceptual encryption of JPEG2000 files or bitstreams in the context of digital rights management (DRM) schemes. These methods are efficient in the sense of minimizing the computational costs of encryption. A classical bitstream-based approach employing format-compliant encryption of packet body data is compared to a compression-integrated technique that uses the concept of secret transform domains, in our case a wavelet packet transform.